What does matchmaking mean in CSGO?

The matchmaking system will take your lower-skilled friend into consideration when finding a match. Additionally, the system makes a prediction about how well each team member will perform in a match, so losing a match with a lower skilled player on your team is not likely to significantly impact your skill group.

What does Prime matchmaking do in CSGO?

What are the benefits of Prime Status? Users with Prime Status are matchmade with and against only other Prime Status users in all game modes. Prime users also earn XP, Competitive Skill Groups, and are eligible for weekly item drops. These benefits apply exclusively to Prime users.